`define idle 0
`define r0 1
`define r1 2
`define r2 3
`define r3 4
`define finished 5
`define turn_arnd 6


`define A_INIT 32'h67452301
`define B_INIT 32'hefcdab89
`define C_INIT 32'h98badcfe
`define D_INIT 32'h10325476